I have an ancient system where I can only use the original daytime/time protocols (at tcp ports 13 and 37). This system can't use NTP because of limited storage capacity on the device.
How do I enable OPNsense as a server providing this, preferably in a way which survives upgrades?
I have used the search, but couldn't find much because of the very generic search terms.
You need to enable the time service in the file /etc/inetd.conf by removing the comment sign in the first column. Then enable the inetd service by placing this into /etc/rc.conf.d/inetd:
inetd_enable="YES"
Then reboot or `service inetd start`.
I have no idea if this survives updates, sorry. You will also have to open the ports in your firewall rules for the interface in question.
Got it working, thanks!